Which one of the following is a wrong statement?

1.	Most of the forests have been lost in tropical areas
2.	Ozone in upper part of atmosphere is harmful to animals
3.	Greenhouse effect is a natural phenomenon
4.	Eutrophication is a natural phenomenon in freshwater bodies

Which one of the following pairs of gases are the cause of 'Greenhouse effect'?

1. ${\mathrm{CO}}_2$ $\mathrm{and}$ $\mathrm{CO}$

2. ${\mathrm{CFC}}_{\mathrm{s}}$ $\mathrm{and}$ ${\mathrm{SO}}_2$

3. ${\mathrm{CO}}_2$ $\mathrm{and}$ ${\mathrm{N}}_2\mathrm{O}$

4. ${\mathrm{CO}}_2$ $\mathrm{and}$ ${\mathrm{O}}_3$

dB is a standard abbreviation used for the quantitative expression of:

1. the density of bacteria in a medium

2. a particular pollutant

3. the dominant Bacillus in a culture

4. a certain pesticide

The two gases making the highest relative contribution to the greenhouse gases are:

1. $C{O}_2$ $and$ $C{H}_4$

2. $C{H}_4$ $and$ $$ $N{O}_2$

3. $\mathrm{CFCs}$ $\mathrm{and}$ ${\mathrm{N}}_2\mathrm{O}$

4. $C{O}_2$ $and$ $N_{2}O$

Chipko movement was launched for the protection of:

1. grasslands

2. forests

3. livestock

4. wet lands

Montreal protocol aims at:

1. reduction of ozone depleting substances

2. biodiversity conservation

3. control of water pollution

4. control of CO₂ emission

Biochemical Oxygen Demand (BOD) in river water:

Global agreement in specific control strategies to reduce the release of ozone-depleting substance was adopted by:

1. Rio de Janeiro Conference

2. The Montreal Protocol

3. The Kyoto Protocol

4. The Vienna Convention

Which one of the following statements is correct?